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# coding: utf-8 # Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved. # This software is dual-licensed to you under the Universal Permissive License (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl or Apache License 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose either license. from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives.asymmetric import rsa import threading class SessionKeySupplier(object): # Magic number recommended by cryptography.io docs. Also see: http://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html PUBLIC_EXPONENT = 65537 def __init__(self, key_size=2048): """ A supplier which vends public and private keys, and can refresh the keys it uses. :param int key_size (optional): The key size to use when generating private keys. Defaults to 2048 if not provided. """ self.key_size = key_size self.private_key = rsa.generate_private_key( public_exponent=self.PUBLIC_EXPONENT, key_size=self.key_size, backend=default_backend() ) self._refresh_lock = threading.Lock() def get_key_pair(self): self._refresh_lock.acquire() private_key = self.private_key self._refresh_lock.release() return {'private': private_key, 'public': private_key.public_key()} def refresh(self): self._refresh_lock.acquire() try: self.private_key = rsa.generate_private_key( public_exponent=self.PUBLIC_EXPONENT, key_size=self.key_size, backend=default_backend() ) finally: self._refresh_lock.release()
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